Our relationships with our siblings are often the longest we will ever have. They can also be the messiest. This bond, or lack thereof, has an enormous impact over our lives – it can affect our personality, our health, and our happiness. WHYY talked about managing our sibling relationships as an adult, why they are often so complicated, and if they can be rebooted later in life. JONATHAN CASPI, a family therapist and professor at Montclair State University, and GEOFFREY GREIF, professor at the University of Maryland School of Social Work and author of Adult Sibling Relationships where their guests.